30-year climate normals

Sanilac County Climate and Weather Averages

Hottest month — July

77.1°

average daily high. The coldest month is January, averaging a low of 18.7°F.

Sanilac County gets 30.37" of precipitation a year, and 32% of it falls in Aug, Sep, Oct.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	30.2°	18.7°	1.72"
February	31.1°	18.8°	1.40"
March	38.8°	25.9°	2.06"
April	50.1°	35.4°	2.98"
May	61.6°	45.1°	2.92"
June	71.3°	55.7°	2.49"
July	77.1°	61.6°	2.84"
August	76.1°	61.6°	3.42"
September	70.0°	55.5°	2.92"
October	58.6°	45.1°	3.27"
November	46.0°	34.6°	2.37"
December	35.1°	25.9°	1.98"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 32% falling in the wettest three months (Aug, Sep, Oct).

January 1.72"

February 1.40"

March 2.06"

April 2.98"

May 2.92"

June 2.49"

July 2.84"

August 3.42"

September 2.92"

October 3.27"

November 2.37"

December 1.98"

Annual total 30.37"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 446

Heating degree days How much heating the climate demands 6,942

Approximate annual cooling cost At 22.01¢/kWh, Michigan average $98

Approximate annual electric heating cost Lower where heating is gas rather than electric $535

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Sanilac County, where electricity is one line of eight.

Common questions

What is the weather like in Sanilac County?

Sanilac County averages a high of 77.1°F in July and a low of 18.7°F in January. Annual precipitation is 30.37 inches, with essentially no snow.

When is the rainy season in Sanilac County?

The wettest stretch is Aug, Sep, Oct, which accounts for 32% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Sanilac County?

The average daily high in July, the hottest month, is 77.1°F. That drives 446 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sanilac County?

Effectively no. Measurable snowfall is rare in Sanilac County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station PORT HOPE, MI US (USW00094898), 40.3 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Michigan residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.